No apparent need to isolate. Based on the low potential for mites due to your routine treatments I am thinking some sort of leaf stress as indicator for something else. Now the hard part...What is the "something else" and how do we adjust?

Try this...bump up the watering by 1x more per week and hold off fertilizing for the rest of February. Then observe results and see if new growth continues to be problematic. My thinking relates to clearing out salts in the soil.

Been sitting with my laptop hoping that you'd answer. Relieved that it's not mites and isolation not needed. It's been resting next to some bigger beauties. I'll do just that and see what gives in another week or so. Thanks once again K.

You are welcome. You might need a couple of weeks to see any change. I see that kind of leaf stress on some of mine in hot summer (July, Aug,) and usually bump up watering to almost daily. That usually does the trick.

Warm summer is March to June and then Sep to Nov. Cool summer is Dec to Feb and winter is 6-7 random non consecutive days spread out in January. I think it may be safe after next week for me to selectively bring plants back out.

K,

See a change in the plant already just giving it a couple of good soaks. Thanks very much:)

Nancy